[ACL] Suppoprt add rule incrementally for data plan rules

[ezio-chen]

What I did

• Fix "config acl update increment" command to add rule incrementally.
• Fix acl_loader can't add source-ip or destination-ip with IP prefix is not 32

How I did it

Do not delete all existed rules for data plan rules, just add the new rules to configDB.

How to verify it

Verify on broadcom platform

1. Add ACL table L3_TABLE

  admin@sonic:~$ sudo config acl add table L3_TABLE L3 -p Ethernet0

2. Add rule.json

  admin@sonic:~$ sudo config acl update incremental rule.json
  # rule.json
  {
    "acl": {
      "acl-sets": {
        "acl-set": {
          "L3_TABLE": {
            "acl-entries": {
              "acl-entry": {
                "1": {
                  "actions": {
                    "config": {
                      "forwarding-action": "DROP"
                    }
                  },
                  "config": {
                    "sequence-id": 1
                  },
                  "ip": {
                    "config": {
                      "source-ip-address": "10.0.0.1/16",
                      "destination-ip-address": "10.0.0.2/32"
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }

3. Update rule increment with rule2.json

  admin@sonic:~$
  # rule2.json
  {
    "acl": {
      "acl-sets": {
        "acl-set": {
          "L3_TABLE": {
            "acl-entries": {
              "acl-entry": {
                "2": {
                  "actions": {
                    "config": {
                      "forwarding-action": "ACCEPT"
                    }
                  },
                  "config": {
                    "sequence-id": 2
                  },
                  "ip": {
                    "config": {
                      "source-ip-address": "10.0.0.3/16",
                      "destination-ip-address": "10.0.0.4/32"
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }

4. Verify rules

  admin@sonic:~$ aclshow -a
  RULE NAME     TABLE NAME      PRIO    PACKETS COUNT    BYTES COUNT
  ------------  ------------  ------  ---------------  -------------
  RULE_1        L3_TABLE        9999                0              0
  RULE_2        L3_TABLE        9998                0              0
  DEFAULT_RULE  L3_TABLE           1                0              0